You can script a change in the alpha channel of your **guiTexture**. I use **iTween.ValueTo** for this, but you could also use a **Mathf.Lerp**. (iTween also has **FadeTo** and **FadeFrom** functions, but as I've never used them, not sure if they would solve your problem.)
http://itween.pixelplacement.com/documentation.php
http://unity3d.com/support/documentation/ScriptReference/Mathf.Lerp.html
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